Abstract: A preportioning bag used in food operations where a bulk food supply is divided into portions of smaller size, individual portions are located in a bag, and the bag is stored for use at a later date. The bag includes a front wall and a back wall that are joined so that a main body having closed side and bottom edges is defined. Multiple vents in the form of semi-circular slits are formed in the front and back walls of the bag. The front and back walls are constructed of a material that will withstand freezing and heating by microwave or steam. The bag features a day of the week printed thereon and is color-coded accordingly. A set of the bags may be mounted on a saddle structure.